Oe steam-bqilebs



` PATENTED JUNE 27, 1854. J. AMORY lSi` W. P. PARROTT.

STEAM BOILER.

Inventing UNITED sTATEs PATENT oEEIoE.

`JONATHAV AMORY AND WM. P. PARROTT, OF BOSTONQMAVSSAGHUSETTS. i

FURNACE 0F STEAM-BOILERS.

`Specification of Letters Patent No. 11,15, dated J une 2'?, 1854.

T0 all whom #may concern:

`Be it known that we, JONATHAN AMORY and WILLIAM P. PARRoT'r, both ofBoston, 1n

the county of Suffolk and State of Massa` chusetts, have inventedcertain new and use- .l ful Improvements `in Locomotive and Steamto,`forms a.. full and exact specification' of` the same, wherein wehaveset forth the nature and principles of our said improvements, by whichour invention `may `be distinguished from others of a similar class,together with such parts as we claim and det sire to have secured tousby Letters Patent.

` The figures of the accompanyingpplate of drawings represent ourimprovements.

e Figure; 1 `is a central :longitudinal vertical section of aelocomotiveboiler, with our im provements applied thereto. Fig.` 2 is a transversevertical` section of the same taken in the plane ofthe line AB. Fig. 3is a transverse vertical section taken in the plane of the line CD. f, e

Our improvements are designed for the purpose 0f effecting a saving inthequantity of fuel consumed in heating locomotive,

marine, and other steam` boilers, and are more particularly applicableto .Bakers steam boiler furnaces so called. This desideratum ofeconomizing the fuel is effected by supplying the fire chamber with hotair, instead of cold air, thereby rendering the combustion of fuel moreuniform and perfect. In Bakers furnace, asis well known, the unconsumedgases, and other volatile products, which emanate from the fuel, areretarded in their passage to the chimney or delivering flue, by a seriesof reverberatory chambers, of semi-elliptical form, leading from the replace, through which the said products are circulated and retained longenough to exhaust their heat, deliver the same to the boiler, and insuretheir perfect combustion, before they are permitted to escape. Thepassages or chambers under the boiler are thus kept constantly heated,and it is by taking advantage of this circumstance, that we are enabledto convey hot air instead of cold air to the burning fuel. e

We have also made an essential improvjment by which the carbonio acidgas, or

other heavy and incombustible gases, can be conducted out of thefurnace. The presence `livered to the boiler.

of carbonio acid gas, in furnaces,I and pecially in locomotive boilers,has hitherto proved a serious objection, as it is incombustible, andretards the ,combustion of the other products. ,'We eect thisdesideratum of conducting off the carbonio acidgas, by inserting a pipewhich communicates, at one end, with the bottom of thefurnace, and atits other end, with the smoke Hue orpipe.

a a in the drawings represents aL locomotivesteam boiler, surroundingand incasifng a furnace constructed t Bakers furnace. e

Z) b 1s the fire chamber.

on' the principle of chambers, of a curved `or semi-elliptical form,communicating with the fire chaine` ,ber b,an`d formed by the firebridges e, e" &c. In a stationaryengine these chambers d, d &c, may alsocommunicate by meansof the spacesf, f with a serieso-f ovens g, gf i Thesmoke,`

under the re bridges e, e.` gases and other volatile products which es'-cjape from the fuel, pass from fthe fire" chamber through the throatsformed between` eachflre bridge andthe bottom of 7o d, d bSac, are aserlesof reverberatoryl the boiler, into the chambers d, d, and

the form of these chambers, are made to revolve and circulate inthesame, till they are entirely consumed, andtheir heat de- `Thus itwill be seen that the chambers Z d, and the spaces f, f, are keptconstantly hot. In order to make use of this heat, we insert near thebottom of the furnace, and through the 'tire bridges e, c, a pipe ortube h. h', one end of which enters into the fire chamber?) b, whiletheother end communicates with the` cold external air. The cold air, whichthus enters `the pipe L 7L, becomes gradually heated, by passing throughthe said pipe, which is kept hot by the circulation of thevheatedcurrents in the chambers d, spaces f, f &c., and passes directly intothe fire chamber, thus supplying hot air to the said fire chamber,

and insuring a more perfect combustion, and consequently requiring lessfuel, as will readily be understood without further suggestion.

It will be seen from the foregoing description that the pipe It hy iskept hot, not by applying to it heat produced by extraneous means, butsimply by the heat already produced in the ovens or chambers, from themain fire chamber, and that consequently, hot air is supplied to thefuel, in an exceed ingly simplel andr efficacious manner, while t-hepipe h and the air which enters the same, gradually increases in heat asit approaches the fire chamber.

The pipe /zl h instead of entering into the fire chamber as shown in thedrawings, may extend no farther t-han into any one of the reverberatorychambers CZ, CZ, as it will thus supply hot air to the said chambers,and facilitate the combustion of the volatile products in the same, andit will further be p evident that instead of one conducting pipe 7L Lany desired number can be used.

The second part of our invention, by which the heavy and incombustiblegases are conducted oft, consists in inserting a pipe z' z' at the endof the furnace most remote from the fire chamber, and placed near thebottom of the furnace. The other end of the pipe z' z' communicates withthe smoke pipe k. 'The carbonio acid gas, or other heavy landincombustible gases, which retard the combustion of the more volatileproducts,

will be carried along by the heated currents passing through thechambers ci, d, and being heavy, will fall, when arriving at the end ofthe furnace, near to the bottom of the same, and will escape through thepipe i e' z' into the smoke pipe. lThe pipe i z' is 'repevident thatthetwo pipes maybe arranged resented in the drawings, as being of largerdiameter than the pipe L, and the latter pipe as passing through thepipe i z', but it will be entirely independent of each other, but theformer mode is preferable as the external v pipe z', z', acting as ajacket, surrounds the pipe 7L', 7L, with the heated incombustible gases,in their outward passage; whereby an important addition of heat issecured to the air passing through the pipe h, h., which would otherwisebe wasted.

The 'ovens under the fire bridges may be constructed in such a manner asto contain water and be connected to, and make part of the steam boiler,or to contain heated air, as the nature of t-he work or the fuel of theengine requires.

Having thus described our improvements we shall state lour claims asfollows.

c, z', through which the heated and incombustible gases pass, in theirexit from the furnace, substantially as described and fo the purposesspecied.

JONATHAN AMORY. WM. P. PARROTT. Witnesses:

EZRA LINCOLN, JOSEPH GAVETT.

